They just unplug, but there is probably a bit of corrosion if they haven't been unplugged in the past 25 years.

A little spritz of electric contact cleaner on the wires on the back of the plugs will make it easier to unplug the connectors from the switches.

Grasp the top and bottom of the switch (on the unfinished side of the console panel) with one hand.
Then grasp the top and bottom of the plug with your other hand and gently rock the plug top to bottom while tugging at it.
It may be a little stiff at first, but they do eventually unplug.

On the DS window switches, I find it is easiest to first remove the central child lockout plug by rocking it side to side, before unplugging the DS front and DS rear window switches.

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78 W116 300SD 'Desert Rose' new as of 01/26/2014
79 W116 300SD 'Stormcloud' RIP 04/11/2022